blob: 0580a38b3faf6775eb77009443e3f1d7ec966540 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
#include <stdio.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
int main() {
int shmd = shm_open("/shm", O_RDWR | O_TRUNC | O_CREAT, 0755);
ftruncate(shmd, sizeof(int));
int* memory = mmap(NULL, sizeof(int), PROT_READ | PROT_WRITE, MAP_SHARED, shmd, 0);
*memory = 0;
int fod = fork();
if (fod == 0) {
while (*memory < 100) {
*memory += 1;
printf("%d %d\n", getpid(), *memory);
sleep(1);
}
}
else {
while (*memory < 100) {
sleep(2);
*memory += 1;
printf("%d %d\n", getpid(), *memory);
}
}
munmap(memory, sizeof(int));
close(shmd);
if (fod != 0)
shm_unlink("/shm");
return 0;
}
|
